20 points plus !

which function is represented in the table of values?

x 0 -1 -2 -3
y 2 4 8 16

a.
y=2^x
b.
y=2(1/2)
c.
y=-2^x
d.
y=(1/2)^x

Adriana had a garden where he measured the height of a corn plant. what. on the first day, it was 145 cm tall. after 2 weeks is grew by 23 cm. what is the height of the corn plant